| 摘要 |
FIELD: systems for identification of objects. ^ SUBSTANCE: device can be used for reading out stamp applied onto surface of pipe. Device has optical head connected with computer through image introducing printed circuit board. Optical head has two optical channels. First channel has first projection objective with linear magnification of Bet1, focal length f1, angle of field of view tgW1 and relative distortion deltaYob1 within whole angle of field of view and first CCD linear array which is disposed along pipe. Second optical channel has second projection objective with linear magnification Bet2, focal length f2, angle of field of view tgW2 and relative distortion deltaYob2 within whole angle of field of view and second CCD linear array disposed in perpendicular to axis of pipe. The following conditions are met: Bet1= alphaN1/Dmax, Bet2>5Bet1, tgW1=Dmax/L, tgW2=0,2Dpipe/L, alphaN1<=2f'1tgW1, d2<=2f'2tgW2, deltaYob1<1/N1, deltaYob2<1/N2, where alpha is distance between substrates of first CCD linear array, L is distance from optical head to pipe, d2 is length of second CCD linear array, N1 and N2 are number of elements in first and second CCD linear arrays, Dmax is width of scanned area at the surface of pipe. ^ EFFECT: improved precision. ^ 2 dwg |
